The "prismless" outer layer of deciduous and permanent enamel.
D000293:Adolescent; D000328:Adult; D001718:Birefringence; D055598:Chemical Phenomena; D002627:Chemistry, Physical; D002648:Child; D003739:Dental Cementum; D003743:Dental Enamel / Q000033:anatomy & histology*; D006801:Humans; D008852:Microradiography; D008858:Microscopy, Phase-Contrast; D008859:Microscopy, Polarization; D008875:Middle Aged; D014094:Tooth, Deciduous / Q000033:anatomy & histology*; D014095:Tooth, Impacted